GRATING DEVICE, LIGHT-EMITTING UNIT and LIGHT DETECTION METHOD
First Claim
1. A grating device, comprising:
- a substrate;
a blocking layer on the substrate;
a first waveguide on a first region of the blocking layer;
a second waveguide on a second region of the blocking layer;
a first input beam of a TE mode, capable of propagating through the first waveguide;
a second input beam of a TM mode, capable of propagating through the second waveguide;
whereinthe grating device generates output beams by steering the first and second input beams by diffraction, with different steering angles, at least, at one wavelength.
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Abstract
The present disclosure relates to a grating device, a light-emitting unit and a light detection method. The grating device includes a first waveguide and a second waveguide. A first input beam of a TE mode propagates through the first waveguide, and a second input beam of a TM mode propagates through the second waveguide. Output beams are obtained by diffraction which steer the first and second input beams. The first and second input beams have different steering angles at least at one wavelength. The grating device tunes a steering angle by varying a wavelength. The two input beams have different polarization modes, which increases an angle range of steering angles by wavelength tuning. A lidar using the grating device can expend an angle range of detection.
25 Citations
22 Claims
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1. A grating device, comprising:
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a substrate; a blocking layer on the substrate; a first waveguide on a first region of the blocking layer; a second waveguide on a second region of the blocking layer; a first input beam of a TE mode, capable of propagating through the first waveguide; a second input beam of a TM mode, capable of propagating through the second waveguide; wherein the grating device generates output beams by steering the first and second input beams by diffraction, with different steering angles, at least, at one wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light-emitting unit, comprising:
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a polarization controller configured to generate a first input beam of a TE mode and a second input beam of a TM mode; and one or more grating devices which are coupled to the polarization controller to receive the first and second input beams, wherein each of the one or more grating devices comprises; a substrate; a blocking layer on the substrate; a first waveguide on a first region of the blocking layer, through which the first input beam of the TE mode propagates; and a second waveguide on a second region of the blocking layer, through which the second input beam of the TM mode propagates; wherein the grating devices generates output beams by steering the first and second input beams by diffraction, with different steering angles, at least, at one wavelength. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A light detection method, comprising:
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generating first and second input beams, which have different polarization modes, from a source beam; generating output beams by steering the first and second input beams using first and second waveguides, with steering angles corresponding to wavelengths of the first and second input beams; illuminating the output beams onto an object; obtaining reflected beams from the object to generate a detection signal; and processing the detection signal to represent a distance of the object, wherein the first and second input beams have different steering angles, at least, at one wavelength. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification